text: * Aircraft observations. Many aircraft campaigns have been conducted as part of the [https://web.archive.org/web/20070214031222/http://suborbital.nasa.gov/ Suborbital Science Program] and by the [https://web.archive.org/web/20060930215700/http://www.espo.nasa.gov/project/mission2.html Earth Science Project Office] an overview of these campaigns is available. The data can be accessed from the Earth Science Project Office [http://espoarchive.nasa.gov/archive/arcs/ archives].
  * MOZAIC observations. The [https://web.archive.org/web/20070224072918/http://mozaic.aero.obs-mip.fr/web/ MOZAIC] program (Measurement of OZone and water vapour by AIrbus in-service airCraft) was initiated in 1993 by European scientists, aircraft manufacturers and airlines to collect experimental data. Its goal is to help understand the atmosphere and how it is changing under the influence of human activity, with particular interest in the effects of aircraft. MOZAIC consists of automatic and regular measurements of ozone and water vapour by five long range passenger airliners flying all over the world. The aim is to build a large database of measurements to allow studies of chemical and physical processes in the atmosphere, and hence to validate global chemistry transport models. MOZAIC data provide, in particular, detailed ozone and water vapour climatologies at 9–12 km where subsonic aircraft emit most of their exhaust and which is a very critical domain (e.g. radiatively and S/T exchanges) still imperfectly described in existing models. This will be valuable to improve knowledge about the processes occurring in the upper troposphere/ lower stratosphere (UT/LS), and the model treatment of near tropopause chemistry and transport. The MOZAIC data is restricted access, to obtain access the [https://web.archive.org/web/20070108203102/http://mozaic.aero.obs-mip.fr/web/features/database/access.html forms] need to be filled out.
  * CARIBIC observations. The [http://www.caribic-atmospheric.com CARIBIC] (Civil Aircraft for the Regular Investigation of the atmosphere Based on an Instrument Container) project is an innovative scientific project to study and monitor important chemical and physical processes in the Earth's atmosphere. Detailed and extensive measurements are made during long distance flights on board the Airbus A340-600 "Leverkusen" (http://www.flightradar24.com/data/airplanes/D-AIHE/). We deploy an airfreight container with automated scientific apparatuses, which are connected to an air and particle (aerosol) inlet underneath the aircraft. In contrast to MOZAIC, CARIBIC is only installed on one aircraft, but it measures a much wider spectrum of atmospheric constituents ([http://www.caribic-atmospheric.com/ CARIBIC -> instrumentation]). Both, CARIBIC and MOZAIC are integrated in [http://www.iagos.org IAGOS]. Data exist from 1998-2002 and from 2004-today. It can be requested via [http://www.caribic-atmospheric.com/ CARIBIC -> data access].